The nation's spy agency is staring down the barrel of another scandal.
Prosecutors on Tuesday are digging into documents seized during a seven-hour raid of the National Intelligence Service overnight.
The NIS, already a target of public criticism for meddling in the 2012 presidential election, is suspected of tampering with documents to support its charge that a Seoul city government official is a North Korean spy.
The suspicions have gained traction in recent days, after an NIS informant claimed he had yet to receive money he was promised for faking the documents.
The prosecution's raid came hours after President Park Geun-hye ordered a thorough investigation into the case.
This is the second time the prosecution has raided the spy agency since President Park came into office more than a year ago.
In April last year, prosecutors looked into allegations that the National Intelligence Service's former chief ordering agents to drum up support online for then-candidate Park in the 2012 election.
Late last year,.. the National Assembly passed a bill requiring an overhaul of the spy agency and banning it from participating in domestic politics.
The back-to-back scandals are fueling the public's distrust of the NIS,with opposition politicians calling for the resignation of NIS Chief Nam Jae-joon.

"Depending on the investigation outcome, NIS agents involved in the scandal could be charged with breaching the National Security Law for the first time in history.
Yoo Li-an, Arirang News."